Tiger Rock Style 1in Sling Clip Snap Spring Hook. The HK Style 1" Sling-Clip Snap Spring Hook from Tiger Rock is compact and fits slings with an 1" sling swivel stud. Constructed of steel Tiger Rock HK Style Snap Spring Hooks are the same hooks used by the HK Military Special Forces. Tiger Rock uses only superior manufacturing processes and materials in crafting its sling clip snap hooks to ensure they last for years to come. We never compromise on quality and that is evident in all of our slings adapters and mounting hardware. No sling is complete without the SR HK Style 1" Sling-Clip snap Hook. Package Contents: Tiger Rock HK Style 1in Sling-Clip Snap Spring Hook Tiger Rock HK: HK Style 1in Sling Clip Snap Spring Hook